Methods and challenges of a dementia prevalence study
NZSA2024
Claudia Rivera-Rodriguez, PhD
Demonstrated that a prevalence study was feasible in Māori, Chinese, Indian and Pākehā
We found that the sampling/doorknocking strategy was reasonable
We were able to train up multi-ethnic interviewers
Aim: Establish the true current prevalence of dementia in NZ
Populations: Chinese, Indian and Pākehā 65yo+
This talk presents the sampling design and lessons learned from the IDEA study (so far)
There is separate study for Māori (running at the moment too)
We do not have a reliable frame of people 65yo+
Our Chinese and Indian populations are hard to find:
Auckland + Christchurch Region (Christchurch City +Selwyn District+Waimakariri District )
We wanted a design that would yield about the same margin of error for all ethnic groups (i.e. domains)
We run lots of simulations to identify sensible sample parameters:
Commercial/Industrial meshblocks with non-residential dwellings: We replace these with the closest meshblock (based on selection probability) from the same area.
Door-knocking is expensive and difficult.
Training of interviewers in 4 different languages
Consent rates vary across ethnicities: Sampling weights will need adjustment for this.
Data processing from questionnaires in four different languages.